Andreas Malm, the climate academic and author of How to Blow Up a Pipeline, has been blocked from entering the UK before he was due to speak alongside a co-founder of the banned group Palestine Action .

Malm was told by immigration officials his presence in the UK “may not be considered to be conducive to the public good”. He said the decision was “scandalous” and urged the government to reconsider.

Malm, an associate professor of human ecology at Lund University in Sweden, was due to headline a conference organised by Tribune magazine next week on “Washington’s global reign of terror and Britain’s role in reinforcing it”.

He was due to speak alongside Huda Ammori, a co-founder of Palestine Action.…